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From: Stefan Berger <stefanb@linux.ibm.com>
To: linux-integrity@vger.kernel.org
Cc: zohar@linux.ibm.com, Stefan Berger <stefanb@linux.ibm.com>
Subject: [PATCH ima-evm-utils v2 2/4] libimaevm: Remove calculation of a digest over a device file
Date: Thu,  8 Jul 2021 12:04:06 -0400	[thread overview]
Message-ID: <20210708160408.2779849-3-stefanb@linux.ibm.com> (raw)
In-Reply-To: <20210708160408.2779849-1-stefanb@linux.ibm.com>

Signature verification on device files is not supported by IMA in the
kernel, so remove calculation of digests over devices files.

Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
Reviewed-by: Mimi Zohar <zohar@linux.ibm.com>
---
 src/libimaevm.c | 14 --------------
 1 file changed, 14 deletions(-)

diff --git a/src/libimaevm.c b/src/libimaevm.c
index 2856270..4d51901 100644
--- a/src/libimaevm.c
+++ b/src/libimaevm.c
@@ -225,16 +225,6 @@ static int add_link_hash(const char *path, EVP_MD_CTX *ctx)
 	return !EVP_DigestUpdate(ctx, buf, len);
 }
 
-static int add_dev_hash(struct stat *st, EVP_MD_CTX *ctx)
-{
-	uint32_t dev = st->st_rdev;
-	unsigned major = (dev & 0xfff00) >> 8;
-	unsigned minor = (dev & 0xff) | ((dev >> 12) & 0xfff00);
-
-	log_info("device: %u:%u\n", major, minor);
-	return !EVP_DigestUpdate(ctx, &dev, sizeof(dev));
-}
-
 int ima_calc_hash(const char *file, uint8_t *hash)
 {
 	const EVP_MD *md;
@@ -281,10 +271,6 @@ int ima_calc_hash(const char *file, uint8_t *hash)
 	case S_IFLNK:
 		err = add_link_hash(file, pctx);
 		break;
-	case S_IFIFO: case S_IFSOCK:
-	case S_IFCHR: case S_IFBLK:
-		err = add_dev_hash(&st, pctx);
-		break;
 	default:
 		log_err("Unsupported file type (0x%x)", st.st_mode & S_IFMT);
 		err = -1;
-- 
2.31.1


  parent reply	other threads:[~2021-07-08 16:04 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-08 16:04 [PATCH ima-evm-utils v2 0/4] libimaevm: Remove digest calculations not supported by IMA Stefan Berger
2021-07-08 16:04 ` [PATCH ima-evm-utils v2 1/4] evmctl: Remove filtering support for file types unsupported " Stefan Berger
2021-07-08 16:04 ` Stefan Berger [this message]
2021-07-08 16:04 ` [PATCH ima-evm-utils v2 3/4] libimaevm: Remove calculation of a digest over a directory Stefan Berger
2021-07-08 16:04 ` [PATCH ima-evm-utils v2 4/4] libimaevm: Remove calculation of a digest over a symbolic link Stefan Berger

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